threewayadj.三路的threenum.三n.三；三个adj.三个的three aspect signal三位显示信号three-pass boiler三回程锅炉three days of talks三天的会谈three pole sounding三极测深three point contact三点接触three-piece suite三件套家具； 一套三件的家具three major demands三大需求three R's principlethree defense lines三道防线three-drum system三鼓法